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5,ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 3,AIR QUALITY AND GREENHOUSE GAS EMISSIONS Table 5.3-4 SUMMARY OF PROJECT GREENHOUSE GAS EMISSIONS Percent Reduction Baseline Project Over Operational Category (MT CO2elyr)e (MT CO2etyr)h Baselines Area Sources 31.3 30.9 1.3% Energy Usage Residential Natural Gas 7,108 3,333 53% Electricity 7,355 5,015 32% Nan-Residential Natural Gas 382 179 53% Electricity 1,320 928 30%9 Mobile Sources 42,657 33,175 22% Solid Waste 1,027 1,027 0% Water 910 827 9.1% Swimming Pools 229 38 83% Total Before BPS Reductiond 61,019 44,552 27.0% BPS Percent Reductiond — -- 2.6% Total After BPS Reductiond 61,019 42,951 29.6% Vegetation(amortized)e -136 -136 0% Total with Vegetation 60,883 42,814 29.7% Notes: MT CO2e1yr=million tons of carbon dioxide equivalent per year,BPS=Best Performance Standards. a Baseline emissions for area sources,mobile sources,waste,and water are calculated by CalEEMod using 2005 as the modeled year.Baseline energy emissions for residential land use types are calculated using San Joaquin Valley Air Pollution Control District(SJVAPCD)baseline metrics for energy use,which are 2.88 MT CO201DUtyr for natural gas and 2.98 MT CO2e1DUiyr for electricity use(with"DU"representing a dwelling unit).The reduction achieved between this baseline metric and the project emissions is applied to non-residential land uses after removing the benefit for EnergyStar appliances from residential land uses.Baseline emissions here represent the project if it were built out in a business-as-usual manner.Additional methodology information and assumptions are detailed in Appendix C. n Project scenario represents emissions from the project in 2020. C Consistent with SJVAPCD guidance,the percentage reduction was calculated as the difference between the baseline and project emissions divided by the Baseline emissions. d Shea Homes has committed to incorporating BPS measures into the project.These are described in Mitigation Measure AIR-2 below. Vegetation sequestration numbers presented here have been amortized over 40 years.The project would result in a net increase in vegetation and sequestered carbon dioxide(CO2).This sequestration was not included in the 29 percent comparison,but is listed here for informational purposes only. Source:Environ,2011. (917I11) 5-44